Question
PQ is a line of length 18 cm. A point R is placed such
that PR = 5 cm. If PR is increased by 40%, what percent does QR decrease?Solution
ATQ,
PQ = 18 cm
PR = 5 cm
Therefore, QR = 18 – 5 = 13 cm
New PR = 1.40 × 5 = 7 cm
New QR = 18 – 7 = 11 cm
Percentage decrease = {(13 - 11)/13} × 100 = 15.38%
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